I don't think Westhill should be slow at all.
Should be blind, fast, flowing, quick and demanding! Not all tracks have to be all technical, slow turns and tight. Fast racing tracks and Westhill is a great example are sometimes the hardest to keep on pace, consistent and quick. You go off line or wide in 1 turn, you have lost alot of time on the next straight etc. You have to be quick around the turn etc.
A street track for example, you can brake late, gas later etc on some turns depending on whats next. Maybe thats just me though, im quicker, more consistent with much better race craft on the south city, fern bay rather then the long Aston configs and Westhill. It requires a whole different driving style, and in LFS, we have ALOT of slow turns.
I say add another Westhill config, slow it down maybe here or there if needed, but its reputation is fast and blind like said earlier, that's its characteristics and history.